Modeling of Grid-Connected DFIG-Based Wind Turbines for DC-Link Voltage Stability Analysis

Hu, Jiabing; Huang, Yunhui; Wang, Dong; Yuan, Hao; Yuan, Xiaoming

doi:10.1109/tste.2015.2432062

Cited by 218 publications

(108 citation statements)

References 17 publications

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“…If grounding transformer is lost, LG fault causes the phase to neutral voltages on the un faulted phases. In the average value model, the value of current or voltage waveform, which gives the DC value of variables over the specified selected interval of time and the ripples are neglected [6], [7], [8], [9]. DFIG technology allows maximum energy extraction from the wind by modulating turbine speed and also minimizes mechanical stress on the turbine whenever there is more flow of wind.…”

Section: Fig3: Simulation Circuit Model For Gridmentioning

confidence: 99%

Design of a Harmonic Filter for a Grid Connected Doubly Fed Induction Generator under Unsymmetrical Fault Conditions

Soumya*¹,

Rao²

2020

IJITEE

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The analysis and controlling of harmonics in a doubly fed induction generator (DFIG) is studied under the unsymmetrical fault conditions in MATLAB/SIMULINK software. The proposed DFIG uses wind energy as the primary source for which is used for power generation. Wind energy is a non-polluting renewable energy resource that is available free of cost but when the wind is used, harmonics are introduced into the power system, so voltage imbalances occur in the grid. In order to mitigate the voltage imbalances (or) ripples in the voltage or current, LCL filters are introduced in the wind turbine because they are chiefly used for high power and low-frequency applications. Various unsymmetrical faults are simulated by referring the specifications selected and analysed with the tripping time for the desired duration of time in the circuit breaker, voltage and current waveforms are analysed only during the transient period on the basis of FFT analysis to know about THD content.

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Section: Fig3: Simulation Circuit Model For Gridmentioning

confidence: 99%

Design of a Harmonic Filter for a Grid Connected Doubly Fed Induction Generator under Unsymmetrical Fault Conditions

Soumya*¹,

Rao²

2020

IJITEE

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“…In the event that no dissipation is considered, once the DC-link capacitor has been fully charged by the power-frequency transformer and the diode rectifier bridge, the power from the FSIG should all flow into the grid. The equation can be given as P generator ¼ P grid (13) Once the voltage drops, the LVRT-DVR will be cut in and all power produced by the generator will be transferred through the LVRT-DVR. However, not all power can be transferred into the grid because of the voltage difference on the output terminal of LVRT-DVR; redundant power can be calculated by…”

Section: Power Flow Of Lvrt-dvrmentioning

confidence: 99%

“…Nowadays, variable‐speed wind turbines have become the standard solutions for wind power plant installations, represented by double‐fed induction generator (DFIG) and permanent magnetic synchronous generator . Many practical LVRT strategies for DFIG have been discussed in Zhu and Chen et al, Xiao et al, Zhu and Zou et al, and Xie et al and proved highly effective.…”

Section: Introductionmentioning

confidence: 99%

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A dynamic strategy to improve the ride-through capability of a fixed speed induction generator

Hong

Jiang

Wang

2018

Int Trans Electr Energ Syst

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Summary Based on the analysis of the short current of the fixed speed induction generator (FSIG) under symmetrical system faults, a strategy using the dynamic voltage restorer (DVR) is proposed to improve the low‐voltage ride through (LVRT) capability of FSIGs. During the system fault, LVRT‐DVR is connected in series between the grid and the generator by switching‐off the by‐pass bidirectional thyristors and provides a compensating voltage to isolate FSIG from the system fault. To increase the switch‐in speed of LVRT‐DVR, an antivoltage technique is used to shut the thyristors off immediately. After the fault is cleared, the phase‐shifting control is applied to avoid phase jumps of the FSIG terminal voltage. The PSCAD/EMTDC simulation and field tests have been carried out to prove the effectiveness of the proposed LVRT strategy, and related conclusions and comments are summarized.

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“…As declared in [12], weak AC system deteriorates DC-bus voltage control stability and limits power transfer ability in VSC-HVDC. Likewise, eigenvalue analysis in [13] and [14] shows that damping ratio for DC-bus voltage control in variablespeed wind power generator becomes reduced with decrease of AC system strength. The authors in [15] conclude that DC voltage stability of VSC-HVDC connected to weak grid gets damaged with increase of power flow through eigenvalue analysis and frequency domain approach, which conforms with the time domain simulation results in [16].…”

Section: Introductionmentioning

confidence: 97%

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

Huang

Yuan

et al. 2016

IEEE J. Emerg. Sel. Topics Power Electron.

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163

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With widely application of voltage source converters (VSCs) in power system, DC-bus voltage control instabilities increasingly occurred in practical conditions, especially in weak AC grid, which poses challenges on stability and security of power converters applications. This paper aims to give physical insights into stability of DC-bus voltage control affected by ACbus voltage control in VSC connected to weak grid. Concepts of damping and restoring components are developed for DC-bus voltage to describe stability of DC-bus voltage control. Impact of AC-bus voltage control on DC-bus voltage control stability can be revealed by investigating impact of AC-bus voltage control on damping and restoring components essentially. Furthermore, detailed analysis for impact of AC-bus voltage control on damping and restoring components are presented with considering varied AC system strengths, operating points, and AC-bus voltage control parameters. Simulation results from 1.5-MW full-capacity wind power generation system are demonstrated which conform well to the analysis. Finally the experiment results validate the analysis. Index Terms-DC-bus voltage control, AC-bus voltage control,small-signal stability, voltage source converter, weak grid. . His current research interests include gridintegration of large-scale renewables, modular multilevel converter (MMC) for HVDC applications, and transient analysis and control of semiconducting power systems. Dr. Hu is the author/coauthor of more than 70 peer-reviewed technical papers and one monograph "Control and Operation of Grid-Connected Doubly-Fed Induction Generators", and holds more than 20 issued/pending patents. Her research interests include dynamic modeling, stability analysis and control of power system with multi power converters.Dong Wang was born in Huanggang, Hubei, China, in 1988. He received the B. Eng. and M. Eng. degree from Huazhong University of Science and Technology in 2012 and 2015, respectively. He is currently working toward the Ph.D. degree in the Department of Electrical and Electronic Engineering at The University of Hong Kong. His research interests include modeling and control of wind turbines, in particular on small signal stability analysis and control of grid-integrated DFIG-based Wind Turbines in electromagnetic timescale.

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Modeling of Grid-Connected DFIG-Based Wind Turbines for DC-Link Voltage Stability Analysis

Cited by 218 publications

References 17 publications

Design of a Harmonic Filter for a Grid Connected Doubly Fed Induction Generator under Unsymmetrical Fault Conditions

Design of a Harmonic Filter for a Grid Connected Doubly Fed Induction Generator under Unsymmetrical Fault Conditions

A dynamic strategy to improve the ride-through capability of a fixed speed induction generator

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

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